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Fix nested error handling in PG_FINALLY

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We need to pop the error stack before running the user-supplied
PG_FINALLY code.  Otherwise an error in the cleanup code would end up
at the same sigsetjmp() invocation and result in an infinite error
handling loop.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/95a822c3-728b-af0e-d7e5-71890507ae0c%402ndquadrant.com
This commit is contained in:
Peter Eisentraut 2019-11-07 09:54:09 +01:00
parent a0c96856e8
commit 581a55889b
2 changed files with 6 additions and 4 deletions
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2
src/backend/utils/adt/xml.c
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@ -3868,7 +3868,7 @@ xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt)
result = xmlBuffer_to_xmltype(buf);
}
PG_FINALLY()
PG_FINALLY();
{
if (nodefree)
nodefree(cur_copy);

8
src/include/utils/elog.h
View File

@ -338,14 +338,16 @@ extern PGDLLIMPORT ErrorContextCallback *error_context_stack;
} \
else \
_do_rethrow = true; \
{
{ \
PG_exception_stack = _save_exception_stack; \
error_context_stack = _save_context_stack
#define PG_END_TRY() \
} \
PG_exception_stack = _save_exception_stack; \
error_context_stack = _save_context_stack; \
if (_do_rethrow) \
PG_RE_THROW(); \
PG_exception_stack = _save_exception_stack; \
error_context_stack = _save_context_stack; \
} while (0)
/*